faktor dari 25x² - 81 adalah...
a (5x-3)(5x-3)
b (5x-9)(5x+9)
c (5x-9)(5x-9)
d (5x-3)(5x+3)
a (5x-3)(5x-3)
b (5x-9)(5x+9)
c (5x-9)(5x-9)
d (5x-3)(5x+3)
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Verified answer
Penjelasan dengan langkah-langkah:
jawabannya B. (5x-9)(5x+9)
=(5x-9)(5x+9)
=5x(5x+9)-9(5x+9)
=25x²+45x-45x-81
=25x²-81
Materi : Bentuk Aljabar
Konsep ( a - b )² = a² - b²
25x² - 81
= (5²)x² - (9²)
= ( 5x - 9 )²
= ( 5x - 9 )( 5x - 9 ) { c. }
Semoga bisa membantu
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